Wiring a Crossover with MTH RealTrax

We have had many questions from customers on where to locate the lock-on when
building a crossover between mainlines on the layout. Lock-on location is critical in
order to maintain power to the engine throughout the layout.

Since MTH RealTrax track uses an ABS roadbed, the three rails are electrically insulated
from each other. Additionally, MTH RealTrax switches use a non-derailing system of
insulated outer rail in order to throw the switch as the train approaches if it is not properly
oriented. Because of this, in crossover situations the outside rail may not be completely
electrically continuous from one loop to the other. To compensate for this, the lock-on(s)
must be positioned so that power is routed around the insulated sections of rail. The
accompanying illustration shows how to do this.

Another way around this situation is to run a jumper wire between the center-wiring
terminals (ACG) of each switch. This ties the grounds of the switches themselves, and
makes sure that the ground from the transformer is shared by both main lines.