Should allow upgrading to 6 car trains but not allow as many to be bought.

Video walkthrough by @stev1eb (8:36):
https://www.youtube.com/watch?v=sTcNBXX699E
Video walkthrough by @Yokuyin (8:38):
https://www.youtube.com/watch?v=uBSA-mDy_vQ

Results of Let’s play together challenge :
01 8:26 @stev1eb CARD PIN €3
02 8:35 @Yokuyin CARD €2
03 8:44 @Nomiswelt CARD €1
04 9:00 Death of Rats
05 9:11 Zebrakatten
06 9:25 ViperX12
07 9:41 nathou
08 9:49 Seamon
09 9:50 jaynemesis
10 9:57 @Rufrody CARD
11 10:04 @DrCoMaH LUCKY PIN
12 10:08 BenGotham
13 10:08 fendarin
14 10:11 Inigoth
15 10:24 zerpa
16 10:25 Yopt
17 10:26 Rieseningwer
18 10:29 @knightrider87 CARD
19 10:37 kazi123
20 10:43 basementjack CARD
21 10:49 Ashlar
22 10:52 LordJekky
23 10:57 exSaint
24 11:00 kirupenguin
25 11:06 BSIK
26 11:07 LzL
27 11:09 filiponi
28 11:18 Zdenek
29 11:24 BUgingerbear
30 11:25 ltwaffle
31 11:30 unclekrusty
32 11:39 piettro
33 12:09 Glados
34 12:22 sluginarug
35 12:38 TunnelMachine
36 12:59 Qezlot
37 13:02 <@419094454583164948>
38 13:14 OlderThanEwe
39 13:48 Havok
40 13:52 psykit
41 14:01 Unicast
42 14:20 YaroslavTV
43 14:32 BlackKat

your map is on the weeks 'let's-play-together'-contest... And my only regret, is that I didn't get to it sooner, firts time I played it today, third try saw me getting the 'wrong delivery' star, along with the 4 others. Brilliant map. Thumb's up

10:26 on second try. I'm sure it can be done much faster. A very attractive map with a nice short transportation puzzle.

Liked it! Thanks!

A sweet little level to start the day. I like it! Thank you, Herd_Killing! :-)

Looks easy - but isn't. Nice map 6.25 (real time) 13:36 (game time) 5 stars!

Nice little map! Initially not so obvious what order to deliver in, but found an order eventually. 10:18