20 C.F.R. § 203.7
An individual who, prior to January 1, 1937, shall have rendered service to a local lodge or division of a railway labor organization included as an employer under section 1(a) of the act, shall be an employee with respect to such service to such local lodge or division only if he was on August 29, 1935, in the service of or in an employment relation to an employer which was a carrier. An individual who, subsequent to December 31, 1936, shall have rendered service to a local lodge or division of a railway labor organization included as an employer under section 1(a) of the act, shall be an employee with respect to such service to such local lodge or division only with respect to such service as was preceded by service, or an employment relation, on or after August 29, 1935, to an employer which was a carrier. (For the effect of compensation less than $3.00 per month earned after December 31, 1936, for service to a local lodge or division of a railway-labor-organization employer, see part 222 of this chapter.)
20 C.F.R. § 203.7