...operating all or any part of the business of any such employer: Provided, however, That the term "employer" shall not include any street, Interurban, or suburban...now or hereafter operated by any other motive power. The Interstate Commerce Commission is hereby authorized and directed upon request of the Board, or...

...operating all or any part of the business of any such employer: Provided, however, That the term "employer" shall not include any street, interurban, or suburban...now or hereafter operated by any other motive power. The Interstate Commerce Commission is hereby authorized and directed upon request of the Board, or...

...ail or any part of the business of any such employer: Provided, however, That the term '"employer" shall not include any street, interurban, or suburban...now or hereafter operated by any other motive power. The Interstate Commerce Commission is authorized and directed upon request of the [Railroad Retirement]...

...or any part of the business of any such employer: Provided, however, That the term "employer" Khali not include any street, interurban, or suburban electric...exclude any part of the general steam-railroad system now or hereafter operated by any other motive power. The Interstate Commerce Commission is hereby authorized...

...or operating all or any part of the business of any such employer; except that the term "employer" shall not Include any street, interurban, or suburban...transportation, but shall not exclude any part of the general steamroalroad system of transportation now or hereafter operated by any other motive power. The Interstate...

...or operating all or any part of the business of any such employer; except that the term "employer" shall not include any street, interurban, or suburban...transportation, but shall not exclude any part of the general steamroalroad system of transportation now or hereafter operated by any other motive power. The Interstate...

...however, which is decisive, not its form nor the mode of its exercise. (c) The term "employer" does not include any street, interurban, or suburban electric...transportation, but shall not exclude any part of the peneral steam-railroad system of transportation which is operated by any other motive power. (d) The...

...service or operation is insubstantial. (d) The term "employer" does not include any street, in ter urban, or suburban electric railway, unless such railway...the general steam-railroad system of transportation which is operated by any other motive power. (e) The term "employer" does not include any company by...

...status. Electric railways. Service incidental to railroad transportation. Railway labor organizations. interurban, or suburban electric railway, unless such...exclude any part of the general steam-railroad system now or hereafter operated by any other motive power. The Interstate Commerce Commission Is hereby authorized...

...operating all or any part of the business of any such employer: Provided. howrver, That the term "employer" shall not Include any street. Interurban. or suburban...system of transportation, but shall not exclude any pan of the general steam -railroad system of transportation now or hereafter operated by any other...