; Provided further , That such reserve will not exceed one month of benefits payable and may be used only for the purpose of providing for the continuation of transit benefits; Provided further , That the Working Capital Fund will be fully reimbursed by each customer agency for the actual cost of the transit benefit. 104. Hereafter, the Secretary may transfer to the National Surface Transportation and Innovative Finance Bureau, for the purposes of the Bureau, funds allocated to the administrative costs of processing applications for the programs referred to in 49 U.S.C. 116(d)(1) and funds allocated to any office or office function that the Secretary determines has duties, responsibilities, resources, or expertise that support the purposes of the Bureau: Provided , That any such funds, or portions thereof, transferred to the Bureau may be transferred back to and merged with the original account. 105. Section 503(l)(4) of the Railroad Revitalization and Regulatory Reform Act of 1976 ( 45 U.S.C. 823(l)(4) ) is amended— (1) by striking the heading Safety and Operations Account and inserting the heading National Surface Transportation and Innovative Finance Bureau Account, Office of the Secretary