My official "first plarail" and a question

[Super]

What you are calling a 'Diesel is actually not as it is an Electric Hybrid (EH) Freight Engine. Normally when we see a Hybrid it is an electric-diesel but I believe in this case it is because it runs on both AC electrical current (overhead wires) and DC (battery). They apparently did this for the train to make it through some tunnels in Japan. You only have half as it also came with a reversed dummy engine too. Recently it has been re-released (2017) with the updated Plarail AA battery chassis and motor as the first release (2003) was C battery. It also was part of a large freight train set with container and tanker cars. Yours appears to be the original 3 piece C battery release that came with one tank car.

http://www.1999.co.jp/eng/10430003

http://www.1999.co.jp/eng/10048713

http://www.1999.co.jp/eng/10048774

https://www.youtube.com/watch?v=UBPQRL_ZjV4