Train Simulator Classic 2024

Train Simulator Classic 2024

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Structured Approach To Braking Distances
By nerazzurri2014
A guide to help drivers stopping their trains within prototypical distances, using RSSB data, and implementing that into their TS style.
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Premise
In my initial days of TS I always got a bit frustrated at the 'guessing game' I found myself in, regarding when to start braking for station stops primarily, but also stop signals - line speeds and formations, amongst other things, make this highly variable! At that time I was fixated with career scenarios and points so time was of the essence! I wished I could think of a way to shave seconds from my driving. Now, driving in a 'calmer' and more professional manner, I still wanted to find a way of representing something approaching prototypical methods - just for my own satisfaction.

With that in mind, I searched some industry material and found 'Appendix B Signalling Braking Distances for Passenger Trains' of 'Lineside Signal Spacing and Speed Signage', of Railway Group Standard, Issue 4, September 2015 - published by RSSB (if you could search it for yourself, I didn't like to reproduce it here. Page 31. There's also a composite table for all trains I should really look into!) . In it's own words - 'Synopsis. This document specifies the minimum distances that must be provided between the first cautionary aspect and the stop signal to which it applies. In addition, it addresses the signing for permissible speeds and speed restrictions.' That was just what I was looking for and is now the basis for my braking technique.

If I could work out the braking force for any traction I was driving to produce a 'normal brake application' then I could use that along with minimum distance in the document to get quite accurate stopping.
Data
The table lays out minimum stopping distances as described in it's synopsis. Personally I ignore x5mph data and use whole x0mph figures. I also ignore <40mph figures, as by the time you've braked to that speed you can generally see the platform or signal and 'feel' is taking over with your brake control, rather than data.

So the table tells us the minimum distances are (converted to miles for TS) -

40 mph - 258 metres (0.17)
50 - 418 (0.26)
60 - 632 (0.40)
70 - 870 (0.55)
80 - 1190 (0.74)
90 - 1537 (0.97)
100 - 2041 (1.27)
110 - 2041 (1.27)
120 - 2041 (1.27)
125 - 2054 (1.28)

There's 8 distances there. The distances in meters aren't required, I've just shown them for completeness - it's the miles that should be utilised. A bit daunting at first, but it's surprising how quickly they stick in your memory once you start using this method; particularly 40-80mph as these are used most regularly.

Edit: if you search the document you'll also find data for distances on gradients, and deceleration distances to lower speed restrictions, also with gradient values. For me, the gradient figures just over-complicate things and I like to alter the distance on the fly.
Practical Application Of The Data
The data utilised by RSSB, already shown, is married to normal brake applications of trains. It would be unreasonable and unsafe to expect drivers to use emergency braking to stop within those distances, and at the same time train operators can't reasonably expect signalling to be spaced to allow bringing trains to a stand using minimal braking force - both would be unworkable.

So braking instructions for traction sets out a 'normal brake application' (nba for the purposes of this guide now) for that type. It's a braking force which will stop a train within guideline distances 'under normal circumstances'.

So for every train I drive in TS I like to try to know the real world nba. You can often find these on the internet - locodocs.co.uk is a good starting point, or just searching. I should at this point say some traction in TS has poor physics, but most are remarkably realistic.

Once you know the nba for the traction you're driving, and the data for the stopping distance, you now know a guideline braking point for your train. From this initial point you may need to factor things in like gradient, load, rail head conditions, etc. But as I said, that's all it is - an initial guide on your initial distance. As the distance to the point reduces you may need to adjust slightly. But if used correctly, you'll be surprised at how little adjustment is needed.

As an example, a nba for a Class 156 is a step 2 application. This is modelled really well in the TS 156, in fact really well - so much so that breaking curve of a 156, which has tread brakes, will often see you reducing the braking force nearer the stopping point as it rapidly slows at lower speeds.

In comparison, there's some bad examples - like the 158 shipped with the Settle to Carlisle route. On that one step 3 is required to stop within the RSSB distances! That leaves no room for increased adjustment before emergency braking. I just accept it as a bad model and live with the more 'gamey' feel of that braking, mostly braking before I should really need to, in step 2.

In the instances where you can't find information on braking instructions for a particular engine/MU, it's normally pretty easy to guesstimate it. As a starting point I'll work off 2/3rds of the available brake chamber/brake pipe before emergency kicks in, and take it from there.

When I'm driving a new model I always run it out on a Quick Drive over a flat road (I use London to Peterborough, starting at Peterborough), get it up to full speed, and use what I judge a nba to be, and note the braking effect using the mileage to the next point on the HUD. That tells me if the real world/my guessed nba is modelled correctly, or whether I need to modify it for the purposes of TS.

After I've did that I note the braking force for future reference. Sometimes the brake control is notched; other times it's just a %. When searching for an initial % when you know the step for an nba, move the control until it's visually at the required step in the cab then just note the %. It won't be long until you have a list for your TS traction.
Conclusion
I'm not suggesting this a fail safe, 100% accurate, or the best method. I just know it works for me, it's based on real world notions, and it gives me a satisfying experience using it.

There's quite often a bit of adjustment, but that's not unusual to real train driving.

What it DOES do is, reduces the adjustment required from just guessing when you need to break, and hopefully give you the same satisfaction I get. There's nothing like gliding to a smooth, calculated stop on a platform - rather than dumping the brake at the last minute to get your front door on!

I hope you enjoyed reading and it at least gave you some food for thought with your own driving, whatever that outcome is.
22 Comments
inversnecky 31 Jan, 2021 @ 12:40pm 
Thanks for this, just what I need.

As a newbie, I've found that I'm either braking too much too soon, for fear of overshooting a platform, then finding I've stopped 100-200 metres in fron of it, and have to open the throttle again, or I veer to the other extreme and have to rapidly increase the brakes near the end of the platform.

I searched the source of your info, but you need to register to read it. Can anyone register or just railway industry people?

https://www.rssb.co.uk/en/standards-catalogue/CatalogueItem/GKGN0675-Iss-4
TSguy 13 Jul, 2019 @ 10:24am 
How about a Super Class 47? I imagine it's not that much.
darryl23 8 Jul, 2019 @ 1:01pm 
what about for class 377,class 44,450,455,hst,91,442, 365
Alicatt 26 Nov, 2018 @ 10:26am 
Did you follow through on searching for the actual tool they use to calculate braking distance? The ARTC website has a few diffrent tools on it for doing calculations with reference to railways in Australia
nerazzurri2014  [author] 7 Nov, 2018 @ 4:26am 
Vlads, that's a different way of looking at it, simpler too. Quite good as an approximation. My only thought is, at some speeds you're going to be applying more brake force on the fly to compensate - approximately 80, 90, 120, 125. At those speeds your braking force might not be quite enough and you might need a little more than a 'normal application'. That's fine here, it's just not something I like IRL, particularly with potential low adhesion experienced at this time of year. But yeah, for TS, what you point out works as a good starting point - and taking out the guess work is what we're looking for. Thanks for your constructive input V.
vlads 20 Oct, 2018 @ 5:00am 
So... Distance is ".speed" + .10 for each speed higher than 80, +0.0 at near 80 and subtraction of .20 for each less than 80. And it's exactly so: when I apply FSB near long plat', I get the brake distance ~length of the plat' that is near to the train length. Very interesting explanation.
Ewo 30 Jun, 2018 @ 3:45pm 
@nerazzurri2014 I will let you know here when it's done :)
nerazzurri2014  [author] 30 Jun, 2018 @ 8:08am 
Thanks TA.

Yes, it's important to view it in context, relating to other factors.

Drivers have either a braking point, or more commonly a braking zone, acquired through route knowledge and experience.

It's unlikely people have the same level of knowledge on all of their TS routes. So I guess im trying help people identify an initial braking zone where they might normally be guessing.
tangoalpha 30 Jun, 2018 @ 6:16am 
As a newcomer to TS, I'm getting my fair share of SPADs, platform over / undershoots / speeding tickets etc. cos I'm unable yet to judge braking distances, at least not reliably.
I had thought about making some empirical test runs, but to be honest I'm too much enjoying visiting my old haunts up and down the Medway Valley. Anyhow, along comes your table, and instantly I can see its value. It may not have sub-micron accuracy for every loco / consist / track grade / weather combination under the sun, but it's a good starting point, and I'm sure I'll quickly get a feel for if I need to brake sooner or later in any given situation.
So thanks, and I look forward to more points & fewer fails :)