Single engines often have a problem when running slow to stall on turnouts and dirty track sections. Will running multiple engines all in the front or at the rear prevent power dropout? What I am trying to say is; if the first engine hits a dead spot in the track, will a second or more engines push the lead engine past the dead spot and so keep the train running? An example would be an A and B diesel where both units have power pickups.

If using traditional Maerklin signals, the locomotives that are not yet in the "stop" zone will continue pushing the train. Given that the cars between the engines are lighter than the engines themselves, this can provoke a derailment if they exert too much pressure on the intermediary cars.
Using two locomotives tandem removes this danger and may help with power gaps, but if one of them does stop, it can result in strain on the second locomotive as it tries to keep motoring. The motors are strong enough to take the wear and tear, but traction tires can deform and will leave more residue on the tracks, worsening the problem down the road.

Regards

Mike C

I connect the red wire (power) from both loks together (disadvantage is you cannot uncouple them because you have an outside wire from one lok connected to the other) but the advantage here is you have both shoes to pick up current for both loks. This way, either both loks run together or both stop together at a slow down module/stop signal together.