OK, I´ll start:
Quality means to me that the engine should be as prototypically accurate as possible. If wheel flanges require a longer wheelbase for the engine to operate properly, that would be OK with me. If it is shortened or lengthened to fit on an existing wheelbase (cf. Märklin/Trix´s Hercules diesel on a class 185 underbody), then that is not OK in my book.
The model should include as many seperate handrails, grabirons, pumps, valves and other whatchamacallits as were/are on the prototype engine. No, or only few, cast-on details, please. Please make them the variety that doesn´t fall off easily, and include some spares if they do anyway. Sprung buffers are fun, btw., for me.
The engine should perform smoothly, accellerate with the amount of pulling force necessary for a train to get going, do so silently for those of us who want to install a sound decoder, and its top speed should not exceed NEM recommendations. The motor shouldn´t get too warm. The gearbox should be solid enough that there is but little wear on the drivetrain. It should be able to climb gradients if they are not too steep. Thus the engine should be of appropriate weight.
The engine should be easily servceable. Disassembly should be easy, and if screws are involved, no self-cutting screws that wear out their holes, please. After the body shell has been removed, access to all points that are to be oiled or greased should be of ease. An 8- or 21-pole DCC connector is a must. A casing where a standard-sized decoder can be placed is a necessity. A casing where a loudspeaker can be installed would be the icing on the cake. Electrical pickup should be reliable, i.e. connecting to as many wheels as possible, yet easily accessable so the modeller can remove dust and lint.
Lighting should be with golden white LEDs, since the yellow or blue variant looks awful, and bulbs heat up and draw a lot of current (I´m thinking DCC). Close coupling should be integrated in the model´s body.
After the break-in period, the engine should be able to accellerate and decellerate smoothly and quietly, without jumping or wobbling on the tracks. Detail should be as fine as feasible. I´d like to be able to place the engine back in its original casing with all small parts installed, thank you. If one snaps off, I´d like to call the factory where it has been made (or ask my dealer to do so) and get a spare part. I want the colors and the printing to be prototypical, no compromising here. Correct size, shape etc. are mandatory, so I haven´t mentioned that so far.
Quality means to me that the engine should be as prototypically accurate as possible. If wheel flanges require a longer wheelbase for the engine to operate properly, that would be OK with me. If it is shortened or lengthened to fit on an existing wheelbase (cf. Märklin/Trix´s Hercules diesel on a class 185 underbody), then that is not OK in my book.
The model should include as many seperate handrails, grabirons, pumps, valves and other whatchamacallits as were/are on the prototype engine. No, or only few, cast-on details, please. Please make them the variety that doesn´t fall off easily, and include some spares if they do anyway. Sprung buffers are fun, btw., for me.
The engine should perform smoothly, accellerate with the amount of pulling force necessary for a train to get going, do so silently for those of us who want to install a sound decoder, and its top speed should not exceed NEM recommendations. The motor shouldn´t get too warm. The gearbox should be solid enough that there is but little wear on the drivetrain. It should be able to climb gradients if they are not too steep. Thus the engine should be of appropriate weight.
The engine should be easily servceable. Disassembly should be easy, and if screws are involved, no self-cutting screws that wear out their holes, please. After the body shell has been removed, access to all points that are to be oiled or greased should be of ease. An 8- or 21-pole DCC connector is a must. A casing where a standard-sized decoder can be placed is a necessity. A casing where a loudspeaker can be installed would be the icing on the cake. Electrical pickup should be reliable, i.e. connecting to as many wheels as possible, yet easily accessable so the modeller can remove dust and lint.
Lighting should be with golden white LEDs, since the yellow or blue variant looks awful, and bulbs heat up and draw a lot of current (I´m thinking DCC). Close coupling should be integrated in the model´s body.
After the break-in period, the engine should be able to accellerate and decellerate smoothly and quietly, without jumping or wobbling on the tracks. Detail should be as fine as feasible. I´d like to be able to place the engine back in its original casing with all small parts installed, thank you. If one snaps off, I´d like to call the factory where it has been made (or ask my dealer to do so) and get a spare part. I want the colors and the printing to be prototypical, no compromising here. Correct size, shape etc. are mandatory, so I haven´t mentioned that so far.