That is how I understood it. A number of Russian revolutionaries were in exile, many residing in Switzerland because it maintains neutrality quite consistently. The train was sealed to prevent communication with the outside world, and it travelled up from Switzerland, through Germany and Scandinavia before arriving in Russia. Germany was banking on Russia withdrawing from the war effort with the success of the revolution, while in turn hoping it wouldn’t spread to their own workers. Hence the sealed carriage.
I would call what happened in Russia a revolution, significant in that there developed a high degree of workers’ control. A lot of that got rolled back under Stalin, but as a step and a demonstration of action it was significant.