What are signal aspects?

Signals have aspects and indications. The aspect is the visual appearance of the signal; the indication is the meaning. In American practice the indications have conventional names, so that for instance “Medium Approach” means “Proceed at not exceeding medium speed; be prepared to stop at next signal”.

What do different train signals mean?

Many other color combinations are used. Some are common, others are unique to a specific railroad. The most constant signals and the easiest to understand are single-head block signals. Red means stop; green means proceed, and yellow means caution or approach, usually indicating that the next signal is red.

What is DCS territory?

Form D Control System (DCS) Rules apply only where designated by TIMETABLE, BULLETIN ORDER, or FORM D LINE 6. Their purpose is to CONTROL THE MOVEMENT OF TRAINS. DCS rules may be used in signaled or non-signaled territory.

What does Approach Medium mean?

APPROACH MEDIUM. Proceed approaching the next signal at Medium speed. DWARF. APPROACH. Proceed prepared to stop at the next signal.

What is two-aspect signalling?

A warner signal is used only in two-aspect signalling (2LQ, MLQ, 2CL). Its purpose is to warn of an approach to a stop signal further ahead, or to advise a driver of the condition of the block section being entered.

What are the different types of signals?

Signals are classified into the following categories:

• Continuous Time and Discrete Time Signals.
• Deterministic and Non-deterministic Signals.
• Even and Odd Signals.
• Periodic and Aperiodic Signals.
• Energy and Power Signals.
• Real and Imaginary Signals.

What speed do you pass a yellow aspect?

70-80 mph
The next aspect will always be yellow unless it changes as more of the train’s route is clear. An unofficial advised speed past this signal is 70-80 mph.

How far apart are train signals?

2 miles
US Signal Layouts Every 2 miles or so the train will pass an Automatic Block Signal (ABS). All ABS signals for all tracks and both directions are located right next to the block entrance at the insulated rail joint (IRJ).