Live support chatInvestigation of Railroad Cab Signal Problems on Steel Deck Bridges
In Investigation of Railroad Cab Signal Problems on Steel Deck Bridges, you'll learn ...
- The operating principles of railroad cab signal systems and coded track circuit communication.
- The mechanisms by which electrical interference, grounding issues, and infrastructure defects affect signal system performance.
- The troubleshooting methods used to diagnose and correct railroad cab signal failures on steel deck bridges.
- How to develop maintenance, testing, and mitigation programs that improve signal reliability and reduce operational disruptions.
Overview
Preview a portion of this course before purchasing it.
Credit: 3 PDH
Length: 42 pages
This study that forms the basis of this course was done in 2004 on a 60 Hz cab signal system that has mostly been replaced by more modern Positive Train Control Systems (PTC) in 2022. However, there are a few 60 Hz systems still in use on some commuter lines. Basically, this course contains information on how railroad locomotive cab signals work and what kind of outside influences can cause maintenance nightmares. It also contains much material about how to troubleshoot problems on railroad signal systems and how to track down causes of complications. There are also appendixes included that contain forms for tracking and recording problems to help with decisions concerning maintenance, testing, and repairs to bridges to mitigate cab signal failures.
The railroad was experiencing a myriad of causes of cab signal dropouts (temporary loss of signal) and total failures where signals were lost through an entire block (section of track separated by insulators from next section). On the steel deck bridges that were observed in this study, there was a combination of problems that were driving maintenance forces insane. This is why outside experts were called in to provide advice on how to mitigate the problems at least to a level where train delays caused by cab signal failures were tolerable. Due to safety and federal regulations, taking the cab signals out of service was not an option. This investigation offered solutions to get the system operating without failures and provide ongoing trouble-free operation in the future.
This course could also be of interest to anyone that enjoys learning about the history of railroad signaling from engineers that dealt with quite unique problems daily during their careers. Although some of the complications at this location have been overcome by modern electronics, some difficulties still remain and some new snags have appeared that still require investigation and trouble-shooting. Although much of the equipment has changed, many similar problems are still with us.
Specific Knowledge or Skill Obtained
This course teaches the following specific knowledge and skills:
- The transmission and reception of coded cab signal information through railroad rails and locomotive pickup coils
- The effects of AC and DC electrical interference on cab signal and track circuit operation
- The influence of utility power induction, rail-to-ground imbalance, and bridge grounding on signal reliability
- The operation and limitations of Electro-Cab 4-60 electronic cab signal generators
- The causes and consequences of signal degradation resulting from rail clip insulation failures and bridge shorts
- The use of rail-to-ground, rail-to-bridge, and cab signal current measurements for system diagnostics
- The application of cable finders, microphones, and field testing techniques to locate electrical faults and short circuits
- The evaluation of track alignment, bridge insulation, and mechanical infrastructure conditions affecting signal performance
- The development of preventive maintenance programs utilizing monthly and quarterly inspection procedures
- How to collect operational, maintenance, and economic data to support signal system reliability improvements and infrastructure investment decisions
Certificate of Completion
You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 15 questions. PDH credits are not awarded until the course is completed and quiz is passed.
| This course is applicable to professional engineers in: | ||
| Alabama (P.E.) | Alaska (P.E.) | Arkansas (P.E.) |
| Delaware (P.E.) | District of Columbia (P.E.) | Florida (P.E. Area of Practice) |
| Georgia (P.E.) | Idaho (P.E.) | Illinois (P.E.) |
| Illinois (S.E.) | Indiana (P.E.) | Iowa (P.E.) |
| Kansas (P.E.) | Kentucky (P.E.) | Louisiana (P.E.) |
| Maine (P.E.) | Maryland (P.E.) | Michigan (P.E.) |
| Minnesota (P.E.) | Mississippi (P.E.) | Missouri (P.E.) |
| Montana (P.E.) | Nebraska (P.E.) | Nevada (P.E.) |
| New Hampshire (P.E.) | New Jersey (P.E.) | New Mexico (P.E.) |
| New York (P.E.) | North Carolina (P.E.) | North Dakota (P.E.) |
| Ohio (P.E. Self-Paced) | Oklahoma (P.E.) | Oregon (P.E.) |
| Pennsylvania (P.E.) | South Carolina (P.E.) | South Dakota (P.E.) |
| Tennessee (P.E.) | Texas (P.E.) | Utah (P.E.) |
| Vermont (P.E.) | Virginia (P.E.) | West Virginia (P.E.) |
| Wisconsin (P.E.) | Wyoming (P.E.) | |
Preview a portion of this course before purchasing it.
Credit: 3 PDH
Length: 42 pages
