The parallel test was designed to both validate the process and prepare staff for future implementation during live operations.
Parallel tamping involves two tamping machines operating side-by-side, typically on crossovers. This technique is more commonly used in regions like the UK, where tighter possession windows demand greater efficiency.
The method is considered superior as it reduces mechanical stress on track components by avoiding the tilting that occurs when tamping one side at a time.
Instead, both sides of the track are lifted and tamped simultaneously, resulting in improved track geometry, a more consolidated ballast compaction and higher quality output.
OTM 751 is typically responsible for tamping switches and crossovers on the network but it is currently undergoing an overhaul in Spremberg, Germany, at our sister company, RailTec.
Therefore its absence was seen as an opportunity to trial parallel tamping. The test shift was conducted at a crossover close to the Rhomberg Sersa siding at Portlaoise, using machines 743 and 742.
One of the initial challenges was the fabrication of a new umbilical cord to link the two machines, enabling them to operate off the same data stream in true tandem.
A key concern was whether the System7 tamping banks on 743 could synchronise with the Plasser banks on 742.
The trial successfully demonstrated that both systems could work in sync.
Thanks are extended to Paul Calahan, the TQS team, and the Irish Rail Per-Way staff for their crucial support during the site walkout, the track design and the execution of the trial.
Overall, the trial was smooth and confirmed that both the machines and crews can operate effectively in a parallel configuration.
While coordinating two machines on one site presents logistical challenges, planning is now underway to implement parallel tamping on the wider network.
A second trial is currently being planned.
