This is a renewed model of the S-25 EH500 Kintaro (third car) design. Vehicles can be interlocked and separated in 3-car configurations. The head car is powered by 2 speeds.
Turn the switch off and turn it by hand.
The third car is a container with 2 small tanks that can be reloaded.
(From Amazon.co.jp)
Plarail S-25 EH500 Kintaro