Each MRT carriage is roughly 40 tonnes, add another 21 tonnes
(320 x 65kg) for passengers. Around 60 tonnes of carriage weight is
resting on the tracks, add friction during acceleration and
braking. 
On railways, a given section of
track is designed to a maximum
axle load. The maximum axle load is related to the
strength of the track, which is determined by weight of rails, density of
sleepers and fixtures, train
speeds, amount of ballast, and strength of
bridges. Because track and especially the rails are expensive, it
is desirable to optimise the track for a given axle load.
If the track is overloaded by trains that are too heavy, it
can be destroyed in a short time. It is convenient for the
steelworks that rails are made in a limited number of sizes, so
that a perfect match of rail weight and axle load is rarely
achieved. New rail is often reserved for heavy main line use, which
releases good but lighter rail that can be cascaded for lighter
duties on branch lines. The lightest rail cascaded from the
lightest branch lines may have no railway use other that for
structural items such as fenceposts, telegraph posts and for
reinforcing concrete. Increase density of sleepers and reduce axle
load can help to increase train speeds.
alamak , the load is not at a single point , its distributed on the
bogie down to the wheels
u sure can load 320 pax in 1 carriage?
