| MCRR | Movement Control and Readiness Reporting | 移动控制和准备报告 |
| MCRR | Machine Check Recording and Recovery | 机器检查记录和恢复 |
| MCRR | Medical Care Research and Review | 医疗保健研究与回顾 |
| MCRR | Michigan Central Railroad | 密歇根中央铁路公司 |
| MCRR | Monongahela Connecting RR Company | Monongahela连接RR公司 |