Simplify train marker to simple dot

### Overview
Simplified the complex 3D train marker to a clean 12px red dot with white border and subtle pulse animation for better visibility and performance

### Key Changes
- [Add detailed changes here]

### Technical Implementation
- [Add technical details here]

### Impact
- [Add impact assessment here]

### Gambaran Umum
[Indonesian translation of description]

### Perubahan Utama
- [Tambahkan perubahan detail di sini]

### Implementasi Teknis
- [Tambahkan detail teknis di sini]

### Dampak
- [Tambahkan penilaian dampak di sini]