Thai railway signalling

The State Railway of Thailand is currently implementing centralized traffic control to link the whole country’s signalling system together using a fiber optic network.

This includes recent double-tracking projects for all mainlines extending from Bangkok.

These consist of three colored light signals (green, yellow and red).

Junction Indicator (5 in-line diagonal white lamps point left or right) may installed above Main or Starter Signal before switches.

If junction indicator is active, the train must proceed at reduce speed.

Level Crossing Advance Warning Marker Post is placed 1 km ahead of this signal to warn train driver of level crossing ahead.

If Signal is not clear driver must slow down the train and proceed with limited speed.

Speed limit sign usually placed along with Home Signal with Junction Indicator to indicate safe passing speed at switches in case of diverging.

In large junction station 2 stage of starter signal may exists.

BTS Skytrain currently use Bombardier CITYFLO 450 CBTC virtual block for signalling and ATP system.

MRT Blue Line use Siemens LZB 700M for signalling and ATP system.

MRT Purple Line Bombardier CITYFLO 650 CBTC moving block for signalling and ATP system.

Airport Rail Link use Siemens LZB 700M for signalling and ATP system.