Tube trains and railways ground to a halt, trapping thousands of people underground and stranding tens of thousands more on rainy platforms.
The suspects watched "trains and railways in the greater Toronto area" and intended to derail a passenger train, said Royal Canadian Mounted Police Chief Superintendent Jennifer Strachan.
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The spills are small compared to the volumes that trains are carrying, and railways are essential in areas that aren't connected to pipelines.
On the railways Edinburgh and Glasgow Central trains were limited and buses replaced trains between Edinburgh and Motherwell.
Indian Railways operates 9, 000 passenger trains and carries some 18 million passengers every day.
So far, out of a total of 25, only three franchises for Chiltern Railways, South Central and South West Trains have been agreed.
The two other prospective franchisees GB Railways and National Express - who own the Central Trains service in mid-Wales - are expected to reveal their ideas in the near future.
On the railways, there are no Arriva Trains services available on Christmas Day and Boxing Day, with only Saturday services running on weekdays until the new year.
Naturally, Rio Tinto is also expanding its mines and the railways that ferry ore from the interior to the ports on trains more than 2.5km (1.6 miles) long.
With a free hand, railways tend to squeeze more trips out of their trains, provide better service and make more money.
In most of France, for instance, private franchise-holders supply the water but local authorities maintain the pipes a solution which, if applied to Britain's railways, would have the government owning carriages and engines but not running trains.
The Swiss Federal Railways has improved efficiency in recent years too, by using double-decker trains and increasing its trip frequency.
Chiltern Railways, First Great Western, London Midland, Scotrail, Stansted Express and Virgin Trains are all subject to cancellations and alterations.
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