49 CFR § 230.105 - Lateral motion.

---
identifier: "/us/cfr/t49/s230.105"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 230.105 - Lateral motion."
title_number: 49
title_name: "Transportation"
section_number: "230.105"
section_name: "Lateral motion."
chapter_name: "FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "230"
part_name: "STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 20103, 20107, 20702; 28 U.S.C. 2461 note; and 49 CFR 1.89."
regulatory_source: "64 FR 62865, Nov. 17, 1999, unless otherwise noted."
cfr_part: "230"
---


# 230.105 Lateral motion.

(a) *Condemning limits.* The total lateral motion or play between the hubs of the wheels and the boxes on any pair of wheels shall not exceed the following limits:

|  | Inches |
| --- | --- |
| Engine truck wheels (with swing centers) | 1 |
| Engine truck wheels (with rigid centers) | 1⁄ |
| Trailing truck wheels | 1 |
| Driving wheels | ⁄ |

(b) *Limits increased.* These limits may be increased on steam locomotives operating on track where the curvature exceeds 20 degrees when it can be shown that conditions require additional lateral motion.

(c) *Non-interference with other parts.* The lateral motion shall in all cases be kept within such limits that the driving wheels, rods, or crank pins will not interfere with other parts of the steam locomotive.