THE BIT TO REMEMBER
The exact point design determines where power flows and whether extra isolation or switching is needed.
The frog is the crossing area
Wheel treads pass through the frog where the rails cross. An insulated frog avoids one wiring problem but creates a short unpowered area. A live frog can improve continuity but needs correct polarity.
Live-frog points need a plan
The frog rails may require insulated rail joiners, and the frog polarity may need switching. The correct method depends on the product and layout. Use the track maker’s diagram.
Do not defeat short-circuit protection
If the controller cuts out, switch off and find the cause. Check for metal objects, wheels bridging opposite polarities and incorrect feeds. Do not bypass the controller’s protection.
A REAL-WORLD EXAMPLE
A short-wheelbase shunter stalls at slow speed on one point but runs elsewhere. Cleanliness, contact and the point’s frog design are useful observations; they do not by themselves prove the locomotive is faulty.
Your next step
- Identify the exact make, range and frog type.
- Watch whether the fault follows one route or one locomotive.
- Check the manufacturer’s insulation and switching diagram.
- Test slowly after correcting the cause.
Read the original instructions
Reviewed 7 October 2026. These beginner notes do not replace the instructions for your exact model.
PECO · Technical advice and point wiring FAQs ↗PECO · Wiring turnouts and crossings ↗