49 CFR § 299.333 - Frog guard rails and guard faces; gauge.

---
identifier: "/us/cfr/t49/s299.333"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 299.333 - Frog guard rails and guard faces; gauge."
title_number: 49
title_name: "Transportation"
section_number: "299.333"
section_name: "Frog guard rails and guard faces; gauge."
chapter_name: "FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "299"
part_name: "TEXAS CENTRAL RAILROAD HIGH-SPEED RAIL SAFETY 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, 20133, 20141, 20302-20303, 20306, 20701-20702, 21301-21302, 21304; 28 U.S.C. 2461, note; and 49 CFR 1.89."
regulatory_source: "85 FR 69731, Nov. 3, 2020, unless otherwise noted."
cfr_part: "299"
---


# 299.333 Frog guard rails and guard faces; gauge.

The guard check and guard face gages in frogs shall be within the limits prescribed in the following table:

Table 1 to § 299.333

| Track class | Guard check gageThe distance between the gauge line of a frog to the guard line  of its guard rail or guarding face, measured across the track at rightangles to the gauge line, may not be less than— | Guard face gageThe distance between the guard lines,measured across the track at right angles to the gauge line, may not be more than— |
| --- | --- | --- |
| H0-H7 | 1,393 mm | 1,358 mm. |
| A line along that side of the flangeway which is nearer to the center of the track and at the same elevation as the gage line. |  |  |
| A line 14 mm (0.55 inches) below the top of the center line of the head of the running rail, or corresponding location of the tread portion of the track structure. |  |  |