Singapore Buses route X26

Spanning East and West, Express service 506 plies between the residential estates of Jurong East and Upper East Coast, via Bukit Batok, Toa Payoh, Bedok Reservoir and Bedok North. It incorporates an express sector along the PIE between Bukit Batok and Toa Payoh, as well as between Kim Keat Link and Jalan Eunos.

Much of the express sectors of this route plies the Pan-Island Expressway (PIE), however buses may ply alternative routes along the Express sector subject to traffic conditions.

Despite being an express route, other basic bus services compliment the route over various sectors. Service 985 connects Bukit Batok with Jln Toa Payoh also via PIE, Services 5 and 59 connect Lorong 6 Toa Payoh / Jln Toa Payoh to Jln Eunos and Service 46 connect between Bedok North Ave 3 and Upper East Coast.

On 15 April 2017, the route passed to London General operating from their Croydon (C) garage and was converted to double deck operation using Wright Eclipse Gemini 2 bodied Volvo B9TLs.