Which type of signal is described as a low interlocking or block signal?

Which type of signal is described as a low interlocking or block signal?

• A. Block signal
• B. Hand signal
• C. Fixed signal
• D. Dwarf signal

Answer: (D)

Dwarf signals are the small, low-profile fixed signals used for interlocking and block signaling. Their compact size places them in areas where space is tight or where a standard, taller signal would be impractical, such as near switches or in yards. Despite their size, they convey the same basic meanings as larger signals (stop, proceed with caution, or proceed) but in a form suited to low clearance and low-height installations. The other option is a full-size block signal, which is larger and used on mainline blocks; a hand signal is a person signaling physically, and a fixed signal is any signal mounted in a fixed position, not specifically the low-profile interlocking/block type.

Dwarf signals are the small, low-profile fixed signals used for interlocking and block signaling. Their compact size places them in areas where space is tight or where a standard, taller signal would be impractical, such as near switches or in yards. Despite their size, they convey the same basic meanings as larger signals (stop, proceed with caution, or proceed) but in a form suited to low clearance and low-height installations. The other option is a full-size block signal, which is larger and used on mainline blocks; a hand signal is a person signaling physically, and a fixed signal is any signal mounted in a fixed position, not specifically the low-profile interlocking/block type.