IMPORTANT: It is important to conduct research to identify the exact location and coordinates of the elephant corridors and elephant crossing points along the tracks to plan where to install the traffic lights.
The solution proposed by the Sri Lanka Wildlife Conservation Society could be the most effective solution due to its simplicity. It could also be easily integrated to the administrative and operations policy framework and traffic code and regulations of the Sri Lanka Railways. Most importantly it would be easy for engine drivers to obey however undisciplined or inebriated they are because locomotive drivers must obey the railway traffic commands and signals.
Trains are controlled by their very own ‘highway code’ to keep them a safe distance apart. Railway lines are divided into sections called blocks where only one train at a time is allowed to be. Traffic light signals (either semaphore or color light signals) control trains, with signals showing cautionary yellow and customary stop and go, red and green lights. Trackside signals (either semaphore or color light signals) control the entry and exit from each block including the speed of the trains, warning trains when the line ahead might be occupied, and if they must reduce speed or stop. Just like on the road, along with the traffic lights there are speed limit signs signaling drivers to reduce speeds in built up areas and where there are hazards.
▪ Green: Proceed at line speed. Expect to find next signal displaying green or yellow.
▪ Yellow: Prepare to find next signal displaying red.
▪ Red: Stop.
▪ | Green: Proceed at line speed. Expect to find next signal displaying green or yellow. |
▪ | Yellow: Prepare to find next signal displaying red. |
Using traffic colour light signals would be the simplest of solutions to stop trains colliding with elephants in areas where the train tracks passes through known elephant corridors such as along the rail tracks from Maho Junction to Trincomalee, Batticaloa, Anuradhapura, Thalaimannar and Kankasanthurai and on the tracks going to Mannar and Jaffna.
Obeying traffic light signals and their rules and regulations are what engine drivers already know whether they are undisciplined or not and it would be easy for them to respond to such commands easily. They can be held responsible if they run lights and kill elephants.
The Sri Lanka Railways needs to establish a Multi-Aspect Signalling method to stop trains colliding with elephants. The Multi and/or Four Aspect Signalling methods were developed to give advanced warning to trains traveling at or over 50 km/hour that there is a red signal ahead and to give the driver the room to stop. By placing a single or double yellow light placed far enough back from the red signal light protecting the entrance to the block ahead gives the driver a warning and a safe braking distance in which to stop. The caution “yellow” signal is provided a block further back from the “red” stop signal.
Similarly a set of colour traffic lights at the approach to the blocks that pass through elephant crossing points along railways tracks and speed signs will not only warn but also indicate to the train engine drivers to reduce their speed to 10 km/hour. At this speed the train can be easily brought to a stop when elephants are spotted crossing the tracks. The train will maintain a 10 km/hour speed until it sees the “go” green light indicating that the train has now passed the blocks in the elephant corridor and can proceed as usual.
The schematic diagram (Figures 1 & 2) below shows a railway line with a Multi Aspect signaling system installed. It shows how this system would work to stop trains colliding with elephants.