| Standard_ID | YS/T 20-1991 (YS/T20-1991; YST 20-1991; YST20-1991) |
| Description (Translated English) | Technical conditions for lap joint type car and shuttle car |
| Sector / Industry | Nonferrous Metallurgy Industry Standard (Recommended) |
| Classification of Chinese Standard | D93 |
| Classification of International Standard | 73.1 |
| Word Count Estimation | 6,000 |
| Date of Issue | 10/16/1991 |
| Date of Implementation | 10/1/1992 |
| Regulation (derived from) | Industry-Science (2010) No. 77 |
| Issuing agency(ies) | China Nonferrous Metals Industry Corporation |
| Summary | This standard specifies the lap shuttle tramcar product classification, technical requirements, test methods, inspection rules. This standard applies to underground mines, railway tunnels Drifting mucking out the lap shuttle tub (hereinafter referred to as the shuttle car). |