Economy at Selangor 

The economy of Selangor is constituted by a progressive market economy. The core sectors of Selangor's economy are commerce and agriculture.

Selangor is the richest state in the country in terms of gross domestic product (GDP) per capita (PPP).On 27 August 2005, Selangor was officially declared the first developed state in Malaysia by the then state government.

Selangor has a recorded highest Human Development Index among the states in Malaysia.

Klang was formerly the terminus of the government railway and the port of the State. In 1880, the state capital of Selangor was moved from Klang to the more strategically advantageous Kuala Lumpur. Rapid development at the new administrative centre in the late 1800s attracted businessmen and job seekers alike from Klang. At this time the only methods of transport between Klang and Kuala Lumpur were by horse orbuffalo drawn wagons, or boat ride along the Klang River to Damansara. Due to this Frank Swettenham stated to Selangor's British Resident at the time, William Bloomfield Douglas,that the journey to Kuala Lumpur was "rather long and boring". He continued to suggest a train line be built as an alternative route.

In September 1882, Sir Frank Athelstane Swettenham was appointed Selangor’s new Resident. Swettenham initiated a rail link between Klang and Kuala Lumpur to overcome the transport problems particularly of the tin mining interests, who needed to convey the ore to Klang's port, Pelabuhan Batu. Nineteen and a half miles of rail track from Kuala Lumpur to Bukit Kudu was opened in September 1886, and extended 3 miles to Klang in 1890.

 The river navigation, however, was difficult as only ships drawing less than 3.9 metres (13 ft) of water could come up the jetty, and thus a new port was selected near the mouth of the river as the anchorage was good. Developed by the Malayan Railway and officially opened 15 years later in 15 September 1901 by Swettenham himself, the new port was named Port Swettenham.