A train hurtling down the track at high speeds requires the driver to look out for signals — akin to road traffic lights — spaced along the track at appropriate intervals to prevent it from crashing into a train ahead.
A 24-coach superfast train travelling at 130 kpmh needs no less than a kilometre while a freight train with a 4,500-tonne, 58-BOXN wagon coal load rolling along at just 80 kpmh will take 2 km to be brought to a grinding halt! Hence a string of signals and the need for an early warning system, with yellow aspect warning the driver of a red signal ahead and the need to slow down.
In case of poor visibility such as fog, standing instructions require him to drop the speed to 15 kmph, remaining ever alert to stop when he is approaching a signal. After a spate of train accidents in the foggy days of the winter of 2011-12, strict monitoring of speeds of trains, particularly the superfast variety, had eliminated all such cases of collision or other train mishaps in the winter of 2012-13.
Hopefully, this winter, too, strict adherence of the standing instructions and rigorous monitoring will ensure a safe environment of train travel, though at the cost of punctuality.
Over the years, European railways have developed a system to tackle this problem, with onboard cab signalling which relays the state of the signals miles ahead. Intercity trains in Europe run over various rail systems across national boundaries, for which a European Rail Traffic Management System has been developed. This consists of a European Train Control System (ETCS) — basically cab signalling and a GSM-R regime — for mobile communication built on the GSM platform.
Understandably, this landmark achievement does not come cheap, though it is ideal for new lines being built such as the western and eastern legs of the dedicated freight corridor. It saves the cost of setting up new line side signalling gear and other communication equipment needed for safe train operations.
Back home, the Delhi Metro has adopted ATO (Automatic Train Operation) and ATP (Automatic Train Protection) systems which ensure regulation of train speed to conform to the condition of the signal ahead, ensuring smooth working even during zero visibility.
Since foggy conditions mostly affect northern states, a system such as the ETCS could perhaps be introduced on railway zones such as northern, northwestern, east central, northeastern and north central, to name a few.
A rough estimate of implementing the basic, no-frills version of the ETCS on limited zones would be over Rs 10,000 crore, an investment that would undoubtedly impact passenger tariff. It would not be welcomed as passengers have already faced a substantial hike in fares in the recent past.
However, given the poor financial health of the nation’s economic lifeline — thanks to the populist policies of Railway Ministers over the last two decades — even such a limited exercise covering just five out of the 16 zones would take years to complete.
Unfortunately, the much-touted ACD (Anti-Collision Device) developed by the Konkan railways would not fit the bill as it only detects another train on the same track and warns the driver of an impending collision. It does not give any indication of the status of a signal ahead, which basically needs to be available in a train driver’s cab in order to overcome the handicap of poor visibility.
Fog normally descends in early hours of morning and major terminals in the north such as Delhi, Chandigarh, Amritsar and Ludhiana are often seriously affected. In the Delhi zone alone, almost a dozen Rajdhanis reach in the wee hours, and its well-heeled and upwardly mobile middle-class passengers on board seldom lose an opportunity to vociferously demand a permanent solution to the problem.
Fortunately, the problem is transient with the average number of such foggy days impacting rail travel being only about 15 to 20 in a year. Moreover, a train may be delayed, but the passenger is sure of reaching his or her destination and not getting stuck in a different city as often happens to hapless airline passengers.
Lastly, a superfast train hurtling along at 130 kpmh and not equipped with in-cab signalling in foggy weather with almost zero visibility, and hundreds of level crossings in its path, where the driver of a tractor-trailer often presumes he has the right of way, is a sure recipe for disaster.
The writer is a former member of the Railway Board