What Is a Rail Tie Plate?
A rail tie plate, also called a base plate or rail plate, is a steel component placed between the rail foot and the sleeper in a rail fastening system. Its main job is to spread the wheel load from the rail over a larger area of the sleeper, protecting the sleeper surface and keeping the rail at the correct inclination. The plate also provides the seating pocket for the rail foot, the shoulders for the clip and the holes for the screw spikes or bolts that fix the whole assembly to the sleeper.
Forged vs Cast Tie Plates
Tie plates are produced by two main processes, and the choice depends on the shape and the production quantity. For forged tie plates, the structure should be less complicated, and the production and mould costs are more economic, which makes forging attractive for standard plates made in large quantities. Cast tie plates, on the other hand, can be made with more complicated shapes and features, but they are generally more expensive. Both types can be manufactured to order as OEM products according to drawings or samples, and both are supplied to AREA and DIN standard profiles.
Typical Tie Plate Specifications.
The specification of a tie plate is defined by its plan dimensions, its thickness, the hole pattern and the incline angle of the rail seat. The incline is usually 1:40, which matches the standard rail foot slope, and plates for special cases use 1:20. The table below shows representative tie plate data for common rail sections.
| Type | Dimension | Holes | Incline | Rail | Weight in kg |
|---|---|---|---|---|---|
| Rph 1/160 | 345 by 285 by 127 by 160, thickness 15/13 | 4 holes of 26 mm | 1:40 | S49/S54 | 7.86 |
| Rp 01/01/160 | 345 by 285 by 127 by 160, thickness 15/13 | 4 holes of 26 mm | 1:40 | S49/S54 | 7.70 |
| Rph 1/210 | 345 by 285 by 127 by 210, thickness 15/13 | 4 holes of 26 mm | 1:40 | S49/S54 | 10.55 |
| Rph 1/210 FVZ | 345 by 285 by 127 by 210, thickness 15/13 | 4 holes of 26 mm | 1:40 | S49/S54 | 10.69 |
| Sph 1a | 345 by 350 by 127 by 410, thickness 15/13 | 8 holes of 26 mm | 1:40 | UIC60 | 20.60 |
| Rph 6/160 | 370 by 310 by 152 by 160, thickness 15/13 | 4 holes of 26 mm | 1:40 | UIC60 | 8.44 |
| Rph 6/210 | 370 by 310 by 152 by 210, thickness 15/13 | 4 holes of 26 mm | 1:40 | UIC60 | 11.32 |
| SZ 60 | 370 by 350 by 152 by 420, thickness 15/13 | 8 holes of 26 mm | 1:40 | UIC60 | 22.73 |
| Rph 11 U | 664 by 554 by 160 | 4 holes of 26 mm | 1:40 | S54 | 15.37 |
| Rph 13 U | 690 by 570 by 160 | 4 holes of 26 mm | 1:40 | UIC60 | 15.27 |
| Rpo 5 | 345 by 285 by 127 by 160, thickness 15/13 | 4 holes of 26 mm | 1:20 | S49/S54 | 8.00 |
Selection and Application Points
Choose the tie plate according to the rail section, the sleeper type and the fastening system. The plate must match the rail foot profile so that the rail seats fully in the pocket, and the incline angle must match the designed rail cant. For concrete sleepers, the plate works together with the rail pad, the clip and the shoulder; for timber sleepers, it is fixed with screw spikes or dog spikes. Check the hole pattern against the sleeper inserts before ordering, and confirm the plate thickness according to the axle load of the line.
Quality and Installation Notes
Inspect the plate for flatness, freedom from cracks and accurate hole positions before installation. The rail seat area must be clean so that the rail foot and the pad make full contact; any dirt or burr will create a local stress concentration. During maintenance, check that the plate has not sunk into the sleeper and that the screws or spikes remain tight, especially after the first weeks of traffic.
Common Misconceptions
A common misconception is that the tie plate is only a spacer. In fact it distributes the load, sets the rail incline and anchors the whole fastening system. Another misconception is that cast plates are always better because they can be made in any shape; in practice, forged plates are more economical for standard shapes and have a more uniform structure. It is also often assumed that any plate with the right rail profile can be used, but the hole pattern and incline angle must match the sleeper and the fastening design as well.
Frequently Asked Questions
What is a rail tie plate? It is a steel plate placed between the rail foot and the sleeper to spread the wheel load, set the rail incline and anchor the fastening components.
What is the difference between forged and cast tie plates? Forged plates are more economic for simple standard shapes, while cast plates allow more complicated designs but cost more.
Which standards are used for rail tie plates? Plates are commonly produced to AREA and DIN standards, and can be made to customer drawings.
What is the incline angle of a tie plate rail seat? The standard incline is 1:40, with 1:20 used for special cases such as the Rpo 5 plate.
Which rails do these tie plates fit? Typical matching rails are S49, S54 and UIC60, and plates can be made for other sections on request.
Why is the hole pattern important? The holes must line up with the sleeper inserts and the screw spike positions so that the plate can be firmly fixed to the sleeper.
