Which forms cannot be combined together?

Form S-K and Form T cannot be combined together because they serve different purposes and are designed for different types of operational communication. Form S-K is specifically used for signal modification requests and communications regarding signaling issues, whereas Form T pertains to train and time-related information. The distinct nature of the information conveyed through each form means that they cannot be used interchangeably or in conjunction with each other, as doing so could lead to confusion or miscommunication regarding train operations.

Understanding the specific uses and limitations of each form within the LIRR Operating Rule Book is essential for maintaining clarity and safety in operations. When forms are not compatible for use together, it ensures that each type of request or notification is handled with the appropriate format tailored for its specific context.