[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR221.5]

[Page 273]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 221_REAR END MARKING DEVICE_PASSENGER, COMMUTER AND FREIGHT TRAINS
 
                            Subpart A_General
 
Sec.  221.5  Definitions.

    As used in this part:
    (a) Train means a locomotive unit or locomotive units coupled, with 
or without cars, involved in a railroad operation conducted on a main 
track. It does not include yard movements.
    (b) Commuter train means a short haul passenger train operating on 
track which is part of the general railroad system of transportation, 
within an urban, suburban or metropolitan area. It includes a passenger 
train provided by an instrumentality of a State or political subdivision 
thereof.
    (c) Locomotive means a self-propelled unit of equipment designed for 
moving other equipment in revenue service and includes a self-propelled 
unit designed to carry freight or passenger traffic, or both.
    (d) Main track means a track, other than an auxiliary track, 
extending through yards or between stations, upon which trains are 
operated by timetable or train order or both, or the use of which is 
governed by a signal system.
    (e) Train order means mandatory directives issued as authority for 
the conduct of a railroad operation outside of yard limits.
    (f) Red-orange-amber color range means those colors defined by 
chromaticity coordinates, as expressed in terms of the International 
Commission on Illumination's 1931 Colormetric System, which lie within 
the region bounded by the spectrum locus and lines defined by the 
following equations:

X+Y=.97 (white boundary)
Y=X--.12 (green boundary)

    (g) Administrator means the Federal Railroad Administrator, the 
Deputy Administrator, or any official of the Federal Railroad 
Administration to whom the Administrator has delegated his authority 
under this part.
    (h) Effective intensity means that intensity of a light in candela 
as defined by the Illuminating Engineering Society's Guide for 
Calculating the Effective Intensity of Flashing Signal Lights, November, 
1964.
    (i) Qualified person means any person who has the skill to perform 
the task and has received adequate instruction.

[42 FR 2321, Jan. 11, 1977; 42 FR 3843, Jan. 21, 1977, as amended at 51 
FR 25185, July 10, 1986]