Consequences of winter weather
The weather has a major influence on the railway network, and extreme weather conditions can result unpredictable departure and arrival times for the trains.
Snow can cause switches to become stuck and increase the wear on trains. We observe that more disruptions occur on the first day of snow or freezing temperatures, so we implement schedule changes when winter weather is forecast. Fewer trains than usual run on these days, and in most places in the Netherlands the trains run every half hour instead of every 15 minutes. Switching to a winter schedule creates room to quickly solve any problems that arise on the rail network. However, winter weather can still result in inconvenience for the travelers, so we recommend that you keep an eye on weather reports and consult Travel Planner Xtra before departure.
Ice under the trains
As the train moves over the track, large chunks of snow and ice can accumulate under the cars. Most of the ice accumulates behind the wheels and around the lines that run underneath the trains. These chunks can then break off when the train runs over a switch in the track. If snow and ice accumulates between the switches, then it can cause switch defects or damage to the bottom of the train or the next train. To prevent this from happening, in winter we regularly spray the bottom of the trains with warm glycol, which makes it difficult for ice to accumulate under the train for several weeks.
Disruptions on the trains
Snow can cause extra disruptions to the train's electrical installations. Wind-blown snow can cause short circuits if it enters the ventilation systems of certain modern trans. The air intake is often positioned low on the side of the train, which makes it easier for windblown snow to block the intake and enter the electrical installation housing. Water from melting snow can also affect the electrical installation. NS is working hard to protect the trains from the effects of winter weather; over the past few years, parts that are sensitive to water and condensation have been replaced and extra inspections have been conducted.
Switches can freeze shut if snow or ice falls between the moving parts of the switch. Heating the switches can prevent this from happening, so when the temperatures approach freezing, ProRail heats more than 5,500 of the more than 7,000 switches on the rail network using switch heaters. ProRail also digs the fill material out from underneath the switches so that snow and ice can fall through without getting stuck between the moving parts. For more information, see the ProRail website.
Ice on the overhead power lines
Trains need sufficient electricity in order to run properly. Ice accumulation on the overhead power lines can cause wear to the train's power connector, which reduces the contact with the power line. In the worst cases, the train no longer receives electrical power and stops running completely. But ice can also cause variations in the current in the power line, which activates the breaker switches and shuts off the power completely. In order to prevent ice from accumulating due to sleet or frost, we try to run as many trains as possible along the route, even if they are empty. We also run extra trains to remove sleet from the overhead power lines.
For more information on sleet and frost, see the Stichting Hollands Spoor website (in Dutch).