Появятся двухдизельные маневровые

[Oleg Izmerov]

За рубежом таккие машины называются multi-engine

Например:
http://govpro.com/products/fleets/gov_imp_75079/
CoGeneration locomotives offer configurations with up to three low-emission diesel engines for a combined force of 2,100 hp. Power-on-demand feature shuts down engines as needed to reduce fuel costs by an estimated 25%, as well as decrease noise.

Трехдизельный тепловоз 2100 л.с., снижение затрат на топливо 25%.