DSB traktor 57 in N scale fits TU-7T Chassis. Warning the TU-7T chassis is not DCC friendly! Infact PWM from a normal decoder will make the coreless motor go hot. All atempts at digitiing a YU-7T is at own risk. This is for the raw unpainted shell only. the side steps needs to be cut off and soldered in to the holes on the side, use a dremmel tool. Use resistor legs or jewel tread to make the handels, some of the holes might clog during the printing process so you maybe need to re drill some of them with a micro drill of 0,4mm.
Update: You can get a better running result by using KATO spare part number 14801D1G which is the motor bogie for the KATO "Portram" This option can be digitalized by ordering a special made decoder from
Nagasue Systems.
(Japanese lettering on the link you can use google to translate, and yes they do ship internationaly)
Make shure to clean away any greas before priming the brass, use a Self Etching primer for best results, a thin lay of zinc spray can also make a fine prime coat on brass.
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Scroll through the pictures to see how to prepare the YU-7T chassis to fit the body and drive smooth on 12 volts
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Decals can be obtained through http://www.skilteskoven.dk/ they are not found in the shop inventory so you will have to write to skilteskoven and ask for DSB traktor 57 decals in N scale.