See a summary of the below results on this page..

Albania

(No answer, but no metros or trams believed to exist)

Armenia

Questionnaire response.

Belarus

Questionnaire response.

Belgium

Questionnaire response.

Bosnia and Herzegovina

Questionnaire response.

Bulgaria

Questionnaire response.

Canada

Questionnaire response.

Croatia

Questionnaire response.

Link to data.

Cyprus

No metro or tram systems.

Czechia

Questionnaire response.

Estonia

Questionnaire response.

Finland

Questionnaire response. 

France

Questionnaire response.

Greece

Questionnaire response.

Hungary

Questionnaire response.

Ireland

Questionnaire response.

Israel

Questionnaire response.

Latvia

Questionnaire response.

Lithuania

There are no metro or tram systems in Lithuania.

Moldova

There are no metros or trams in Moldova.

Netherlands

Questionnaire response.

North Macedonia

No trams or metros in the country.

Poland

Questionnaire response.

Portugal

Questionnaire response.

Metro data.

Romania

Questionnaire response

Russian Federation

Questionnaire response (Russian)

Questionnaire response EN (informal English translation)

Serbia

(Data received, based on ticket sales)

Slovakia

Questionnaire response. (Update 13/11/2019: the available data are confidential.)

Slovenia

No metros or trams in the country.

Spain

Questionnaire response

Link to the INE monthly passenger tracking (all modes): http://ine.es/dyngs/INEbase/en/operacion.htm?c=Estadistica_C&cid=1254736176906&menu=ultiDatos&idp=1254735576820

Sweden

Questionnaire response (pilot).

Switzerland

Questionnaire response

Ukraine

Questionnaire response.

United Kingdom

Questionnaire response.

United States

Questionnaire response.