The project Dn 405.00.000 and project 2497.20.000 with 49E1A3 Switch Blades

In order to solve issues related to the adaptation of railway transportation from 1520mm gauge to 1435mm gauge and restoring the production of switch products of the P50 type, JSC "DnSZ" developed a project for a P65 type diamond crossing of 1/9 grade for 1520 mm and 1435 mm gauges (Dn 405.00.000) and a P50 type switch of 1/11-1/9 grade for 1520 mm gauge (project 2497.20.000) with 49E1A3 switch blades.

On August 29, 2024, a working commission for the qualification testing of the new products was held on the territory of JSC "DnSZ." The commission included representatives from JSC "Ukrzaliznytsia" and specialists from JSC "DnSZ."

 The P65 type diamond crossing of 1/9 grade for 1520 mm and 1435 mm gauges (Dn 405.00.000)

Dn 405.00.000 is designed for right-side crossings where the 1435 mm gauge is to the right of the 1520 mm gauge (Dn 405.00.000 - 01 represents a left-side crossing) and is intended for installation on wooden sleepers to facilitate the movement of rolling stock at railway track intersections. It is used for installation on main and reception-departure tracks. The design consists of two assembled diamond switches, two solid-cast obtuse crossings on gangways, four rails with independent check rails made of 33S1 rail, and screw fastenings on SKL 65 baseplates. The existing P50 type diamond crossing of 1/9 grade (project 1624Dn) was as a reference for the new development. The Dn 405 project incorporates components from serial designs.

The commission concluded that the products successfully passed the tests and are recommended for use on JSC "Ukrzaliznytsia" tracks.

 Photo 1 –  the P65 type diamond crossing of 1/9 grade for 1520 mm and 1435 mm gauges (Dn 405.00.000)

P50 Type Switch of 1/11-1/9 Grade for 1520 mm Gauge, Project 2497.20.000 with 49E1A3 Switch Blades.

Due to the absence of OR50-type switch rails, JSC "DnSZ" has developed and manufactured an P50 type switch of 1/11-1/9 grade with 49E1A3 switch blades (project 2497.20.000), which has the same geometric parameters and operational characteristics as the P50 type switch of 1/11-1/9 grade with OP50-type switch blades (project 2497.10.000).

The locations for track gauge control measurements using a template and the permissible deviations are similar to those of the currently operated P50 type switches with OP50-type switch blades on Ukrainian tracks.

To ensure a consistent rolling surface level for the P50 type stock rail with 49E1A3 switch blades, reduced height switch rail chairs (36 mm) are used instead of the standard 40 mm switch rail chairs, as the height of the switch blade from the 49E1A3 rail is 4 mm higher than that of the OR50-type switch rail blade.

In P50 type switches with switch blades made from 49E1A3 rails, the thickness of the spacer between the switch blade web and the lug is adjusted to maintain a constant distance of 160 mm between the working edge of the stock rail and the axis of the lug, identical to that for switch blades made from R50-type switch rails.

These features allow the use of P50 type switches of 1/11-1/9 grade with 49E1A3 switch blades in new switches, as well as for replacing worn parts in R50 type switches with OR50-type switch blades currently in use on the tracks of Ukrzaliznytsia.

Photo 2 – R50 Type Switch of 1/11-1/9 Grade for 1520 mm Gauge, Project 2497.20.000 with 49E1A3 Switch Blades.

Additionally, the switch blade position stabilizer, project Dn345.05.000, was presented for acceptance.

The switch blade position stabilizer is a technical device used in turnouts to ensure reliable holding of the switch blades in their final positions at train speeds of up to 200 km/h. The switch blade position stabilizer can be used in turnouts installed on both concrete and wooden sleepers.

The installation of the switch blade position stabilizer can be performed at any point along the length of the processed part of the switch blades. The use of the switch blade position stabilizer is advisable in turnouts with long flexible switch blades, allowing the replacement of complex sets with longitudinal connecting rods with simpler and more reliable sets of the 16737Dn type in operation.

The standard fastening assembly of the switch rod yoke is used to attach the switch blade position stabilizer to the switch blades. The stabilizer is attached to the turnout sleepers using screw fastenings.

Reliable holding of the switch blades in their final positions and transitioning from one working position of the stabilizer to another is achieved by a rigid spring.

The threaded rod on the bracket allows for the adjustment of the switch blade's pressure against the stock rail and the size of the gap between the withdrawn switch blade and the stock rail individually for each switch blade.

Photo 3 – Switch Blade Position Stabilizer, Project Dn345.05.000.