Standard No.:	GB/T 16904.2-2006
Chinese Name:	标准轨距铁路机车车辆限界检查 第2部分:限界规
English Name:	Checking of rolling stock clearance for standard gauge railways—Part 2：clearance treadle
Professional Classification:	S04 Basic standards and general methods
Professional Classification:	GB National Standard
ICS Classification:	45.020
Issued by:
Issued on:	2006-12-14
Implemented on:	2007-05-01
Status:	VALID
Replace:	GB/T16904.2-1997 Rolling stock gauges for standard gauge railway. The gauge for upper part of rolling stock
Language:	English
File Format:	PDF
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1 Scope

This part specifies the structure and basic form dimensions, technical requirements, installation and adjustment, quality inspection, painting and marking for the upper part and lower part (hereinafter respectively referred to as "upper treadle" and "lower treadle") of the rolling stock clearance treadle for standard gauge railways (hereinafter referred to as "clearance treadle").
This part is applicable to the design, manufacturing and installation of upper treadles (of basic and widened forms) and lower treadles.

2 Normative References

The following documents contain provisions which, through reference in this part of GB/T 16904, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For any undated references, the latest edition of the document referred to applies.
GB/T 16904.1-2006 Checking of Rolling Stock Clearance for Standard Gauge Railways—Part 1: Methods for Inspecting
GB 146.1-1983 Rolling Stock Gauge for Standard Gauge Railways
GB 146.2-1983 Structure Gauge for Standard Gauge Railway

3 General Requirements of Clearance Treadle

3.1 The clearance treadle is composed of upper treadle, lower treadle, track and foundation. A clearance inspection chamber and clearance treadle detection display system shall be provided, see Figure A.1 of Appendix A.
3.2 Upper treadles can be classified into two forms: basic clearance upper treadle and widened clearance upper treadle. The latter is applicable to clearance checking for such rolling stocks as electric locomotive and double-deck coach.
3.3 The inner contour dimension of clearance treadle shall not be less than the rolling stock clearance specified GB 146.1-1983 or exceed the error range specified by accuracy. The dimension of the fixed part of structure shall meet the requirements of the Structure Gauge-2 specified in GB 146.2-1983.