This decision was later supplemented when there was some question raised by the General Chairman as to the intent of the decision, and on June 14, 1940 he was advised:

.a > a Our decision of January 29th does not imply that the fulfillment of duties of a weighmaster would be exclusively assigned "where clerical force is maintained" nor "that it shall be performed by none other than clerks."

'Our decision of January 29th rendered following conference with you was that the fulfillment of the duties of a weighmaster would be performed by clerical forces at such points as at Paragould where clerical forces are employed. To further clarify the intent of our decision of January 29 * ` ' with respect to claims filed by a clerk at Lexa for a "call" account cars weighed by telegrapher. The yard clerk is ordinarily maintained at Lexa during the vegetable movement only; when so maintained he is on a six day week assignment that does not include Sundays. At such time as there is no yard clerk employed at Lexa, and on such days as Sundays when he is not regularly assigned to work, the weighing of cars is done by other forces, such as agent telegrapher, etc. The decision of January 29th does not mean that because there is a clerk employed at Lexa between 12 M.N. and 9:00 A. M. on week days that he shall be called to weigh cars during the hours of the day that he is not on duty, nor was it intended that he would be called to weigh cars on Sundays, as this is a six day job and not a seven day job.'

This decision and our interpretation of the decision rendered by the Management to the Employes on January 29th was, so far as our records disclose, accepted by the Employes.

"Following the abolition of the position of yard clerk at Pine Bluff on June 25, 1940 and the rearrangement of hours of service of the remaining force, the engine foreman resumed the practice after 6:00 P. M. of weighing cars, a time of day when there were no clerical forces on duty. Assignments were:

Chief Clerk, Cashier and Accountant-8:00 A. M. to 5:00 P. M. Rate Clerk-7:00 A. M. to 4:00 P. M.

Bill Clerk-9:00 A. M. to 6:00 P. M.

General Clerk-6:00 A. M. to 3:00 P. M.

This situation continued until about October 20th and during the interim, July 31st to October 20th, the Employes filed claim, which is the subject of this dispute for a 'call'-three hours at pro rata rate amount $2.17 in favor of F. Oglesby, General Clerk, because he was not called to weigh the cars that were weighed by the engine foreman after the general clerk's hours of service assignment. This is the claim presented by the Employes to the National Railroad Adjustment Board and amounts to, according to their presentation to the Management, $58.59."

POSITION OF CARRIER: "The Employes in this case are attempting to obtain by an award from the National Railroad Adjustment Board creating a condition of employment that they did not obtain through negotiations with the Management. They are attempting to have the weighing of cars classified as clerical work and establish a practice on this railroad that no one other than clerical forces can weigh cars. We have stated to the committee that we were agreeable for clerical forces to weigh cars at such points where they were on duty, but we did not and were not agreeable to give to the Clerks a monopoly of this class of work. It has always been our practice, and heretofore without complaint, for engine foremen to weigh cars. This condition was known at the time he agreement with the Clerks was negotiated and there has been no change in our practice, except as heretofore stated, since the current schedule was negotiated."

OPINION OF BOARD: Whether the work of weighmaster falls within the scope of Rule 1 as it appears in the agreement effective August 1, 1926

we are not now concerned. A controversy arose over the subject. The Organization filed claims on the theory that such work came under the agreement. While those claims were pending negotiations were had which resulted in the following agreement, under date of January 29, 1940, by the Carrier upon the strength of which the Organization withdrew its claims.

That Pine Bluff is a point where a clerical force is employed is not disputed. The Carrier contends, however, that the agreement was intended to extend only to such times as a member of the clerical force is on duty. The Carrier attempted to inject this limitation into the supplemental agreement in a letter dated June 14, 1940 addressed to the General Chairman of the Organization. The latter promptly repudiated the Carrier's interpretation.

It is a well established rule of decision of this Board that it will not supplement the terms of an unambiguous agreement. Of a similar contention made by the Carrier in an analogous dispute in Docket TE-995, Award 1096, is was said: "Under these circumstances-the rule itself being clear and unambiguous-it is unnecessary to go outside the Agreement to discover the intent of the parties, nor is there any basis for altering the express provisions of the rule."

To sustain the Carrier's position here would put a limitation upon the supplemental agreement which cannot be found within its terms.

FINDINGS: The Third Division of the Adjustment Board, after giving the parties to this dispute due notice of hearing thereon, and upon the whole record and all the evidence, finds and holds:

That the carrier and the employe involved in this dispute are respectively. carrier and employe within the meaning of the Railway Labor Act, as approved June 21, 1934;

That this Division of the Adjustment Board has jurisdiction over the dispute involved herein; and

AWARD