When two bodies move in opposite direction, then the Relative Speed = Sum of Speeds i.e for e.g. for a person sitting in a train moving with a Speed of 40 km/hr in the west direction, another train which is going towards east with a Speed of 40 km/hr, will appear to move at a Speed of (40+40) = 80 km/hr.

Time = Distance / speed = 1800/40 = 45 hours. Thus we can find the average speed as: Average Speed = (Total distance)/(Total Time) = (1800 + 1800)/(30 + 45) = 3600/75 = 48 km/hr.

Average speed = Distance / time elapsed = 180 meters / 6 seconds = 30 meters/second. Average velocity = Displacement / time elapsed = 60 meters / 6 seconds = 10 meters/second.

The meeting point for the trains is given by −52.5x+409.5=48x, or 409.5=100.5x. This yields x=27367, or 4 hours and 4 minutes, and therefore the trains meet at 2.04 a.m.

Solution: Two trains means two distance formulas: DA = rA tA and DB = rB tB.

30. Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph….Discussion :: Problems on Trains – General Questions (Q. No. 30)

Air pressure pulse in tunnel when two high-speed trains passing by each other is greater than that in open air when trains running at the same speed, the reason is that complicated pressure pulses produced by trains running into the tunnel is added to the pressure pulse of two trains passing by each other.

Strong side forces occur between the two trains when the front portion of the opposite train passes by. The forces fluctuate rapidly and the maximum suction force occurs when two trains are aligned side by side.

Often, meets that are close can be turned into “rolling meets” because the westbound engineer already knows what train they are meeting, and will slow down, perhaps to just above a crawl, so that the signal clears before they even get to the end of the siding.

Trains are likely to go slower. It’s common practice for rail operators to slow trains down during periods of high temperatures because tracks can “expand” or “distort”. “The tracks can expand in extreme temperatures and trains must travel at slower speeds to ensure customer safety.”

approximately 492 miles

If lightning strikes a train, the steel frame of the train rises in voltage, but the current would flow around the metallic walls of the train car. The operator added that when a train is struck by lightning, the current flows around the outer shell – not through the cabin – and passes through the wheels to the track.

As long as you get out of the car after the lightning strike is over, nothing should happen. But the voltage of the lightning is so high that it may have damaged the outside of the car — scorching paint and fusing side mirrors. In newer vehicles, the computer chips in the engine control systems may be destroyed.

What does stormy weather do to the railway? Floods, high winds and landslips can destroy railway infrastructure and block lines, so our teams repair damage and clear debris to ensure trains can continue to run.

The speed of trains can also be undermined by colder temperatures, because trains are required to stop more often in wintry periods in order to guarantee travel safety. Also, snow and ice can stop signalling points from working as they normally would in the springs and summers.

In general, trains are more resistant to bad weather than either planes or cars. High winds or foggy conditions (which cause trouble for planes) don’t cause any problem for trains. That said, weather can cause trouble.

Cold temperatures may limit the performance and operation of the onboard low-pressure systems, causing the trains to slow down or even stop, in order to guarantee the safety of the passengers.

Because rails are made from steel, they expand as they get hotter, and can start to curve – known as ‘buckling’. Most of the network can operate when track temperatures heat up to 46°C – roughly equivalent to air temperature of around 30°C – but rails have been recorded at temperatures as high as 51°C.