SUBCHAPTER I—GENERAL PROVISIONS Sec. 151. Definitions; short title. 151a. General purposes. 152. General duties. 153. National Railroad Adjustment Board. 154. National Mediation Board. 155. Functions of Mediation Board. 156. Procedure in changing rates of pay, rules, and working conditions. 157. Arbitration. 158. Agreement to arbitrate; form and contents; signatures and acknowledgment; revocation. 159. Award and judgment thereon; effect of chapter on individual employee. 159a. Special procedure for commuter service. (a) Applicability of provisions. (b) Request for establishment of emergency board. (c) Establishment of emergency board. (d) Public hearing by National Mediation Board upon failure of emergency board to effectuate settlement of dispute. (e) Establishment of second emergency board. (f) Submission of final offers to second emergency board by parties. (g) Report of second emergency board. (h) Maintenance of status quo during dispute period. (i) Work stoppages by employees subsequent to carrier offer selected; eligibility of employees for benefits. (j) Work stoppages by employees subsequent to employees offer selected; eligibility of employer for benefits. 160. Emergency board. 161. Effect of partial invalidity of chapter. 162. Authorization of appropriations. 163. Repeal of prior legislation; exception. 164. Repealed. SUBCHAPTER II—CARRIERS BY AIR 181. Application of subchapter I to carriers by air. 182. Duties, penalties, benefits, and privileges of subchapter I applicable. 183. Disputes within jurisdiction of Mediation Board. 184. System, group, or regional boards of adjustment. 185. National Air Transport Adjustment Board. 186. Omitted. 187. Separability. 188. Authorization of appropriations.