It's not that difficult as you think it is.
With my knowledge it should be easy to create this train with wagons, light and horn.
It would have the same features as all my trains.

The thing is that it will not be a self made train, more a ported version. It need to be animated and tweaked too, to work with our API.

I wanted often in the past to create that train. We must consider that this train will have no interior for the driver cabin. Some of the train cars (from HL:Alyx) have interior but still not the train. I will think about it.

Got it, thank you very much! I always wanted to play out a scenario where the combines arrive by train and stuff like that.

Hi Lewon. While they aren't Sligwolf, I did attempt create some vague representations of the Razor Trains - as I agree, they are incredible trains! Fun fact: Most of my maps are built around using them. In my train model pack, you can find a series of Combine-styled locomotives and tonnes of carriage variations. You'll have to find a bogey to attach to them (perhaps Sligwolf's would make a good idea? Albeit, they'd be PHX only for that session!) which there are many to choose from in other addons (admittedly, I have struggled to make bogies)

I hope that this can satiate your desire for a razor train. I made them a long time ago, but occasionally they fly under the radar. For Sligwolf, if you approach this idea for your addon, you can always see what I created to see if it helps with inspiration. It was very difficult making them in Hammer, but I persevered. You'll have better luck with your Blender!