have they ever merged with any other company?
Yes, with Thalys.
Eurostar
On 27 September 2019, the heads of two of Eurostar's major shareholders, Guillaume Pepy of SNCF, and the chair of SNCB publicised that Eurostar is planning to come together with its sister company the Franco-Belgian transnational rail service Thalys. 
where does the eurostar go from in london Amsterdam, Brussels, Bourg-Saint-Maurice, Disneyland Paris, Lille, Calais, Marseille, Paris, and Rotterdam. what is this service? Eurostar is an international high-speed railway service has it received any honors for its service? Yes, it won the Train Operator of the Year award in the HSBC Rail Awards and was declared the Best Train Company in the joint Guardian/Observer Travel Awards. what is the first award? Train Operator of the Year is a rail transport industry award to recognise excellence among train operating companies of the United Kingdom. what are the major religions practiced in the aforementioned country? Christianity, Islam, Hinduism, Sikhism, Judaism and Buddhism. how is the country divided for the purpose of administration? It is divided into counties. what wars did it have to face? Second World War,  Revolutionary and Napoleonic Wars. what are the different ethnicities that can be found here? indigenous British people, Welsh people, Basque people, etc. what are a few of the famous dishes here? Chicken tikka masala when was the previously mentioned railway service launched? 14 November 1994 what are the rules regarding trains? n 2015, Eurostar threatened to require that cyclists dismantle bicycles before they could be transported on the trains. which service competes against it? Deutsche Bahn what is this service? It is a German railway company. does the previous company run double-deckers? The chief executive of Eurostar, Richard Brown, suggested that existing Eurostar trains could be replaced by double-deck trains similar to the TGV Duplex units when they are withdrawn from service. has there been any accidents? There has only been one major accident involving a service operated by Eurostar, a derailment in June 2000.
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Eurostar [SEP] Merger with Thalys
On 27 September 2019, the heads of two of Eurostar's major shareholders, Guillaume Pepy of SNCF, and the chair of SNCB publicised that Eurostar is planning to come together with its sister company the Franco-Belgian transnational rail service Thalys. The arrangement is to merge their operations under the working title of "Green Speed" is to expand services outside the core London-Paris-Brussels-Amsterdam service, to create a grand Western European high-speed rail service covering the UK, France, Belgium, the Netherlands and Germany to serve up to 30 million customers by 2030. , Thalys assisted Eurostar with onwards connections between the two cities of Amsterdam and Brussels, and to provide the Amsterdam to London service, in lieu of passport and customs checks at Amsterdam Centraal station.