FSS Full Form

First Stop Signal

FSS full form shows the first stop signal in the railway platform for arriving trains at the station.

Types of FSS (first Stop signals) for arriving trains

FSS shows that the outer, home, and routing signals control the trains nearing a station.

• FSS Outer signal: Where supplied, the Outer signal is the station's first Stop signal and is positioned at a sufficient distance outside the position until the line might well be impeded once Line Clear has been granted or gained by the station in the rear.
• FSS home signal: The Home signal is also the first Stop signal of a railway platform without an Outer signal and the second Stop signal of a station with an Outer signal. It must be outside every interconnection on the line to which it relates.
• FSS routing signal: The Routing signal is used to convey to a Loco Pilot which of two or more divergent routes is established for him when the Home signal is inconvenient for this purpose.

FSS functionality

• FSS full form represents the first stop signal to display the function of the railway platform, signals, and outer sides. When a Warner signal connects to a gate Stop signal, it must only display 'Proceed 'Once there is appropriate space between the gate Stop signal to the next station's Stop signal. The minimum distance is 1200 meters.
• Multiple Distant signals may be sent. In this situation, the outermost signal, positioned at a sufficient distance from the first Stop signal, is termed the Distant signal, and the other is called the Inner Distant signal. The Distant signal can only display the 'Attention' or 'Proceed' aspect.
• The train stops outside the first Stop signal at stations without a Warner or Starter.
• In foggy or stormy weather or dust storm, Permanent Way Inspectors or the Ganger, Permanent Way Gangmates should immediately arrange for regular Gangmen to place detonators on the rails 270 meters behind the first stop signal in each manner when cautious driving is necessary due to line repairs or other works per Rule 15.09 and the relevant Subsidiary Rules.
• When the Loco Pilot must pass an "ON" IBS signal, he must proceed slowly as outlined in GR 3.75[3] and continue to do so until he reaches the first Stop signal of the station ahead, even if that signal and any intermediate signals are "OFF." The Loco Pilot must watch for any prospective obstructions before reaching the station ahead's first Stop signal.