That is creepy similar to the classic playmobil diesel engine...
I found a picture of the Playmobil diesel shunter 4025, but that is a different locomotive:

Note that the Playmobil locomotive has a window next to the door, and the LGB locomotive doesn't have a window next to the door. I found out that the blue shunter in the (Märklin) LGB set 90450 was first produced as a red LGB Toy Train shunter. Funny is the "TT" marking on the new 90450 shunter, as to date (Märklin) LGB does not use the brand name Toy Train.