Interlocking towers controlled signals and switches at sidings

Here is a Marklin 24994 HO C Track Straight Circuit Track Section

Trainz Product Id: 12106907

or an AC wall adapter or AC/DC power converter (sold separately in my eBay store)

and to make a longer polar express train add this diner car

Chooch Enterprises 8430 HO Single-Track Cut Stone Bridge Pier with Pointed End VariantsUnitPrice_number_61.74 Interlocking towers controlled signals andThis is a Chooch Enterprises 8430 HO Scale Single Track Cut Stone Bridge Pier with Pointed End. Measures 4 5 8 x 1 x 3 3 4 11. 7 x 2. 5 x 9. 5cm. Fits Central Valley Bridge, sold separately. Exquisite large cut stone detail! Features hand cast in durable resin. Can be cut with razor saws, and shaped with files. Ends taper to a point. Very limited production. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9)