Maitree Express: মৈত্রী এক্সপ্রেস - দুই বাংলার সংস্কৃতি ও ভাতৃত্বের মেলবন্ধন - Joydeep Roy

Can anyone tell me the meaning of the abbreviation F.M.?

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Fouling Mark.

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fouling mark?
from irfca faq -
The fouling point or fouling mark is a point to the rear of a converging junction, such that a train must be to the rear of that point in order to ensure that any train moving on the other converging line can proceed without being obstructed.

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Fouling point: The point of a switch turnout where a car or locomotive on one track will obstruct movement on the adjacent track.
click here

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Interesting concept. If I have understood this correctly as provided from your explanation and Shri BG ji's, any movement of train or loco beyond the F.M. point shall obstruct any movement on the adjacent track.

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