Well, for example, the Stadtler KISS trains, if they are DMU, there's a small car in the middle that houses the diesel engine. The EMUs don't have that little middle car. These DMU 120 units do not have a visible power plant car, so I am curious where they have the diesel engine.

http://www.pesa.pl/please-translate-in-en_us-produkty/diesel-multiple-units/

My best guess is there is a diesel engine under the floor, towards either cab. These look like very nice trains, so thank you again for sharing them.

Didnt understand the question but it seems you figured out its lenght vs platform already so I'll count it as answered

Thank you for helping me connect some of the rural communities along the local heavy rail line.

https://twitter.com/dannyman/status/1088322373898579968

Where does the diesel engine fit?

please make a 3 car version of the chirpy