This is how a SkyTrain car is built

 https://www.youtube.com/watch?v=SoiKNvo3sks 

Despite eventually having longer cars than the Chicago_L, the SkyTrain isn't as long as a Chicago L train.

https://en.wikipedia.org/wiki/Chicago_%22L%22#Rolling_stock 

https://jfdatalinks.blogspot.com/search?q=SkyTrain