340 Series Clamps and Clamp Parts – Our Base and Head of Rail Clamps are like no other brand. Designed by engineers with 100 plus years of involvement with railroad signaling, no feature of these products is coincidence. We know what makes shunt clamps better, more suited to the uses of railroad signaling and those concepts are all included in these products. Many customers buy our clamps to repair or retro-fit other brand shunts. Follows is an ordering guide for our standard Base and Head of Rail Clamps. And, because every component of our Shunts is maintainable, questions about Clamp part ordering references are frequently a subject of phone calls. The same ordering guide provides you with a way to refer to the parts you want to buy. It gives you and us a common point of reference. Use the information in this section to help you get what you need.