The dwarf CPLs at Brunswick come in many configurations. Here's an 8-lamper
dressed up with two marker lamps for 10 total. You'd be hard pressed to find
a dwarf CPL with more lamps. The most common CPL configuration had 6 lamps.
Eight-lamp CPLs were often found near rail yards because they have the upper-left
and lower-right lights necessary to display a "Restricting" aspect. A Restricting
aspect advises the train's operator to proceed without stopping, but do so at a
speed slow enough to stop before any track obstruction he may observe on
his own.
When lit, the Restricting speed indicators are a slightly blue-tinted white color
like that of the Moon, hence they are sometimes called a "lunar" aspect. The
example photo at right comes courtesy David Malohn. The lunar aspect is
also used to alert operators that they are entering unsignalled territory and
thus must proceed cautiously under their own judgment.
|