Explanations:
Kerala, a state in southern India, is known for its well-developed infrastructure, including its railway network. However, not all districts in Kerala are connected by railway lines. The railway network in Kerala is extensive, but certain districts face geographical and topographical challenges that make railway connectivity difficult or impractical. The two districts in Kerala that do not have railway lines are Idukki and Wayanad.
Idukki is a district located in the Western Ghats, a mountain range that runs parallel to the western coast of India. The terrain in Idukki is rugged and hilly, which makes the construction of railway lines challenging. The district is known for its natural beauty, including the Periyar Tiger Reserve and the Idukki Dam, but the terrain has made it difficult to establish railway connectivity.
Wayanad, another district without railway lines, is also located in the Western Ghats. The district is known for its scenic beauty, including the Wayanad Wildlife Sanctuary and the Chembra Peak. The hilly terrain and dense forests in Wayanad have made it difficult to establish railway lines. The district is connected to other parts of the state and the country through roadways, but the railway network has not been extended to this area.
In contrast, other districts in Kerala, such as Pathanamthitta and Kollam, do have railway lines. Pathanamthitta is connected to the railway network through the Pathanamthitta railway station, which connects it to other parts of the state and the country. Kollam, located in the southern part of Kerala, is also connected to the railway network through the Kollam Junction railway station.
Understanding the geographical and infrastructural development of Kerala's districts is crucial for answering questions related to railway connectivity. The absence of railway lines in Idukki and Wayanad is due to the challenging terrain and the focus on other modes of transportation in these districts.