鉄道郵便局
Most countries have many sorting offices; the USPS has about 275. Some small territories such as Tahiti have only one. Sorting vans were used at various times; the UK had sorting vans, or carriages, in their Travelling Post Offices but those services were terminated in 2004. while in the USA the Railway Mail Service used a Railway post office for sorting the mail. As of 2017, Germany has about 95–98 sorting offices across the country.